Don’t lose your progress!

We cover every section of the GMAT with in-depth lessons, 5000+ practice questions and realistic practice tests.

Up to 100+ points GMAT score improvement guarantee

The best guarantee you’ll find

Our Premium and Ultimate plans guarantee up to 100+ points score increase or your money back.

Master each section of the test

Comprehensive GMAT prep

We cover every section of the GMAT with in-depth lessons, 5000+ practice questions and realistic practice tests.

Schedule-free studying

Learn on the go

Study whenever and wherever you want with our iOS and Android mobile apps.

The most effective way to study

Personalized GMAT prep, just for you!

Adaptive learning technology focuses on your academic weaknesses.

Plugging In: Using Good Numbers

Eleven years ago Tina was half as old as Ike will be in four years. If Ike is $$m$$ years old now, how old is Tina now in terms of $$m$$?
Correct. [[snippet]] Checking this answer gives >$$\frac{m}{2} + 13 = \frac{10}{2}+13 = 5 + 13 = 18$$ This matches your **goal value** of 18, and none of the other answer choices do. So that means this is the correct answer.
Incorrect. [[snippet]] If you check this answer choice, you get >$$4m - 11 = 4(10)-11 = 40-11 = 29$$ This doesn't match your **goal value** of 18, so eliminate this answer.
Incorrect. [[snippet]] You should not do any math here. It should be clear that this doesn't match your **goal value** of 18, so eliminate this answer.
Incorrect. [[snippet]] If you check this answer choice, you get >$$4m+11 = 4(10)+11 = 40+11 = 51$$ as the numerator. Dividing this by 2 will not give an integer, so this doesn't match your **goal value** of 18. Eliminate this answer.
Incorrect. [[snippet]] If you check this answer choice, you get >$$2m-7 = 2(10)-7 = 20-7 = 13$$ This doesn't match your **goal value** of 18, so eliminate this answer.
$$4m - 11$$
$$\frac{m}{2} + 13$$
$$\frac{1}{2m - 22}$$
$$\frac{4m +11}{2}$$
$$2m-7$$